Edging machine



y 1950 e. E. BONIN 2,508,009

EDGINGMACHINE Filed Sept. 11, 1946 4 Sheets-Sheet 1 [Em e;

INVEIYTOR. 660296 5150mm BY G. E. BONlN EDGING MACHINE May 16, 1950 4 Sheets-Sheet 2 Filed Sept. 11, 1946 INVENTOR. c0296 6. B02202.

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y 1950 a. E. BONlN 2,508,009

EDGING MACHINE Filed Sept. 11, 1946 4 Sheets-Sheet 5 /L E 4 5 Z INVENTOR. *0 6602996 5 13072672.

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May 16, 1950 G. BONIN EDGING MACHINE 4 Sheets-Sheet 4 Filed Sept. 11, 1946 INII/ENTOR. 60296 513mm. BY @kw. T

Patented May 16, 1950 EDGING MACHINE George E. Benin, Sonthbridge, Mass., assignor to Simonds Machine 00., Inc., Southhridge, Mass, a corporation of Massachusetts Application September 11, 1946, Serial No. 696,220

1 Claim.

This invention relates to machines for grinding the edge of a rotated optical lens or other similar object to a predetermined outline determined by an associated rotating pattern plate.

It is the general object of my invention to provide an edging machine which will accurately reproduce a predetermined pattern in any desired size.

Further objects are to provide improved means for holding the lens with any desired pressure, improved driving means for the lens and pattern, and improved means for starting and stopping the work.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claim.

A preferred form of the invention is shown in the drawings, in which Fig. l is a, plan view of my improved machine;

Fig. 2 is a side elevation thereof, partly in section;

Fig. 3 is a front view, looking in the direction of the arrow 3 in Fig. 2;

Fig. 4 is an end view, looking in the direction of the arrow 4 in Fig. 3;

Fig. 5 is a sectional view, taken along the line 5-5 in Fig. 4;

Fig. 6 is a front elevation, partly in section, of the work spindle and work support assembly;

Fig. 7 is an end view of the assembly, partly in section taken along the line 1-1 in Fig. 6;

Fig. 8 is an end view of a lock nut; and

Fig. 9 is a side elevation thereof, partly in section.

Referring to the drawings, my improved edging machine comprises a base Ill supporting a driving motor M, and a grinding wheel Gmounted on a shaft ll rotatable in a housing I2 fixed on said base. The wheel G is driven from the motor M by a, V-belt I4 connecting grooved pulleys l5 and Hi, the pulley l5 being on the armature shaft l1 and the pulley I6 being on the wheel shaft l l.

A work head (Figs. 2 and 6) is pivoted at 2| to brackets 22 on the base l6 and supports a work driving spindle 24 mounted in bearings in a spindle head portion 25. A worm gear 26 is fixed on the spindle 24 and. is rotated by a worm 2'! mounted on a short shaft 28 (Fig. 7), which in turn is connected by a flexible shaft 30 to a worm gear 3| (Fig. 2) mounted on a shaft 32 rotatable in a fixed bearing bracket 33. The worm gear 3| is engaged by a worm 35 (Fig. 1), which is mounted at one end of the armature shaft l1.

The motor M thus drives the grinding wheel G at relatively high speed by means of the belt [4 and pulleys l5 and i6, and drives the work spindle 24 at relatively low speed through the worm 35, worm gear 3|, flexible shaft 30, worm 2'1 and worm gear 26. The flexible shaft 30 permits swinging movement of the work head 2i! duringcontinuous rotation of the work.

The work W is indicated as an optical lens or curved disc which is clamped between a supporting member mounted at the end of the work spindle 24 and a supporting member 4! which is pressed against the opposite side Of the lens or work and which is engaged by a cap 42 rotatably mounted on the end of a, tail spindle id axially slidable in the tail-stock portion 46 of the work head 20. The work-engaging end of the cap 42 is preferably convexly curved to permit slight angular displacement of the member 4|. The tail spindle 44 has an axial recess 48 to receive a plug 50 having a shank 5 I. threaded in a, stud 52 rotatably mounted in a bearing 54 in the tail stock 46.

A spring 56 is mounted in the cylindrical recess 48 of the tail spindle 44 between the bottom of the recess and the plug 56 and acts to force the tail spindle 44 toward the work W. A knob 51 is mounted on the stud 52 and is used to turn the stud. An index 58 is carried by the plug 56 and'is associated with graduations 59 (Fig. 1). By turning the knob 51 and stud 52, the plug 5% may be shifted axially to increase or decrease the compression of the spring 56 and the setting of the spring will be indicated by the index 58.

The worm shaft .28 (Fig. '7) is rotatably mounted in eccentric bearings in a support fill which ispivoted in the work head 20 and. which is provided with a handle 62. By swinging the handle 62 and thus partially turning the sup= port 60, the eccentrically-mounted worm gear 2'! and shaft 28 may be moved toward or away from the work spindle 24 to engage or disengage the worm 2! with respect to the worm gear 26. Very convenient means is thus provided for starting and stopping the work spindle.

A pattern plate P (Figs. 2 and 6) is removably secured to the side of a hand wheel 63 which is slidable on the end of the work spindle 24. A look nut 64 is threaded on the end of the work spindle and may be tightened to secure the hand wheel and pattern plate on the spindle.

As it may be necessary to change the pattern plate rather frequently, the particular form of lock nut shown in Figs. 8 and 9 has been found very desirable. In this look nut, a hole 65 (Fig. 9) is provided, which is at a, very substantial angle to the axis of the nut 64. A tap of the desired size is then passed axially through the nut and produces the fragmentary threads indicated at 66 and 61. The opening 65 is of larger diameter than the outside of the tap, so that as soon as the nut is loosened and slightly withdrawn, the nut may be tilted to clear the partial threads and may be thereafter freely removed.

Considerable time may thus be saved over the usual operation of continuously turning the nut until the nut is bodily removed axially from the threaded spindle.

The pattern plate P on the work spindle 24 engages an abutment 70 (Fig. 2) and as the work spindle is continuously rotated, the reaction between the plate P and the abutment 10 swings the work W toward or away from the wheel G, thus reproducing the contour of the pattern plate on. the edge of the work. The finished work piece will always be of the same contour as the pattern plate but may be of the same size or larger or smaller according to the setting of the abutment 10 relative to the grinding surface of the wheel G.

I have made special provision for shifting the abutment 10 to control the work size, as best shown in Figs. 4 and 5. The abutment 70 (Figs. 4 and 5) is slidable in a support H which is mounted on a fixed part of the base ID. A short shaft 12 is rotatably mounted in the support H and is provided with a scroll cam 14 which engages a cam follower I5 fixed to the abutment 10. A compression spring 1'! (Fig. 4) holds the cam follower l5 seated against the cam 14.

A small hand wheel 80 is fixed to the end of the cam shaft 12 and may be used to turn the shaft. A lock nut 82 is threaded on a portion of the stud 12 and may be used to securely hold the desired setting of the cam 14. By thus turning and locking the cam, any desired endwise adjustment of the abutment 10 may be secured and reliably retained.

A disc 83 is keyed and slidable on the stud 12 and rotates therewith. The disc may be graduated as indicated in Fig. 3 to show the setting of the abutment l0 and to indicate the relative size of the work to be produced.

Insertion and removal of the work W is facilitated by the provision of a handle I00 (Fig. 6) associated with segmental gear teeth l9l which engage rack teeth I02 on the under side of the tail spindle 44. By depressing the handle, the tail spindle may be withdrawn against the pressure of the spring 56.

It will be noted from Figs. 2 and 7 that the work head pivot 2| is forwardly ofiset, so that the weight of the work head ordinarily supplies all of the pressure needed for the edging operation. Additional pressure may be applied in any convenient manner if found desirable.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claim, but what I claim is:

In an edging machine, a work head, a work spindle rotatably mounted thereon, a tail spindle aligned with said work spindle and having a rotatable work-engaging cap, said tail spindle being longitudinally recessed, a coil spring mounted in said recess, a plug axially slidable in said recess in said tail spindle and engaging one end of said coil spring and said plug having a threaded and rearWardly-extending shank, a device mounted on and movable axially with said plug and visibly indicating the axial position of said plug in said work head, and said device being also efiective to prevent rotation of said plug and said tail spindle in said work head, and a stud rotatably mounted axially in the rear end of said work head but held from axial movement therein and internally threaded to receive the threaded shank of said plug, and. said stud being manually rotatable to adjust said threaded shank and plug axially to vary the spring pressure on said tail spindle and on said work-engaging cap.

GEORGE E. BONIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 691,225 Wilson Jan. 14, 1902 772,894 LeBlond et al. Oct. 18, 1904 892,923 Winans July 7, 1908 912,518 Wilhelm Feb. 16, 1909 927,949 Clark July 13, 1909 1,072,282 Waninger Sept. 2, 1913 1,191,874 Day July 18, 1916 1,227,243 Bugbee May 22, 1917 1,228,418 Eaton June 5, 1917 1,324,454 LaFortune Dec. 9, 1919 1,455,863 Bugbee May 22, 1923 1,616,178 Daniels Feb. 1, 1927 1,651,501 Baker Dec. 6, 1927 1,651,532 Maynard Dec. 6, 1927 1,659,560 Bausch Feb. 21, 1928 1,666,746 Maynard Apr. 17, 1928 1,845,478 Bullard Feb. 16, 1932 1,966,375 Brick July 10, 1934 2,175,719 Long Oct. 10, 1939 2,209,605 Maynard July 30, 1940 2,246,055 Maynard June 17, 1941 2,261,537 Zamarra Nov. 4, 1941 2,321,383 Harper June 8, 1943 2,352,608 Archer July 4, 1944 FOREIGN PATENTS Number Country Date 253,093 Great Britain Dec. 23, 1926 

